RKI Instruments 65-2485RK-02 Owner's manual

Brand: RKI Instruments

Model: 65-2485RK-02

Type: Owner's manual

RKI Instruments, Inc.

www.rkiinstruments.com

65-2485RK-02

Multi Point Detector

Operator’s Manual

Part Number: 71-0237RK

Revision: B

Released: 6/17/20

2 • 65-2485RK-02 Multi Point Detector

WARNING

Read and understand this instruction manual before operating detec-

tor. Improper use of the detector could result in bodily harm or death.

Periodic calibration and maintenance of the detector is essential for

proper operation and correct readings. Please calibrate and maintain

this detector regularly! Frequency of calibration depends upon the

type of use you have and the sensor types. Typical calibration frequen-

cies for most applications are between 3 and 6 months, but can be

required more often or less often based on your usage.

65-2485RK-02 Multi Point Detector • 3

Product Warranty

RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in

materials, workmanship, and performance for a period of one year from date of shipment from

RKI Instruments, Inc. Any parts found defective within that period will be repaired or

replaced, at our option, free of charge. This warranty does not apply to those items which by

their nature are subject to deterioration or consumption in normal service, and which must be

cleaned, repaired, or replaced on a routine basis. Examples of such items are:

Warranty is voided by abuse including mechanical damage, alteration, rough handling, or

repair procedures not in accordance with the operator’s manual. This warranty indicates the

full extent of our liability, and we are not responsible for removal or replacement costs, local

repair costs, transportation costs, or contingent expenses incurred without our prior approval.

THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES

AND REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER

OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS, INC.

INCLUDING BUT NOT LIMITED TO, THE WARRANTY OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS,

INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL LOSS OR

DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS PRODUCTS OR

FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY.

This warranty covers instruments and parts sold to users by authorized distributors, dealers,

and representatives as appointed by RKI Instruments, Inc.

We do not assume indemnification for any accident or damage caused by the operation of this

gas monitor, and our warranty is limited to the replacement of parts or our complete goods.

a) Absorbent cartridges d) Batteries

b) Pump diaphragms and valves e) Filter elements

c) Fuses

4 • 65-2485RK-02 Multi Point Detector

Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Mounting the Multi-Point Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Wiring the Multi-Point Detector to a Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Introducing Incoming Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Setting the Zero (Fresh Air) Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Replacing Components of the Multi-Point Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Calibration, H

S and CO Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Calibration, Oxygen Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Setting the Fresh Air Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

65-2485RK-02 Multi Point Detector • 5

Overview

This manual describes the 65-2485RK-02 multi point direct connect detector. This manual

also describes how to install, start up, maintain, and calibrate the detector when it is used with

a gas monitoring controller. A parts list at the end of this manual lists replacement parts and

accessories for the detector.

Specifications

WARNING: Do not use this product in a manner not specified in this instruction manual.

Table 1 lists specifications for the multi-point detector.

NOTE: The following symbol on the detector label is a caution to the user to refer to this

documentation for installation and operation instructions:

WARNING: When using the 65-2485RK-02, you must follow the instructions and warnings

in this manual to assure proper and safe operation of the 65-2485RK-02 and to

minimize the risk of personal injury. Be sure to maintain and periodically

calibrate the 65-2485RK-02 as described in this manual.

Table 1: Specifications

Target Gas O

S/CO

*Note: Since the 65-2485RK-02 is a direct connect

detector, calibration is done at the controller.

Area Classification Explosion proof for Class I, Groups B, C, and D

Sampling Method Diffusion

Detection Range O

: 0 to 25 %volume

S: 0 to 100 ppm (parts per million)

CO: 0 to 300 ppm (parts per million)

Response Time 90% in 30 seconds

Accuracy Oxygen

± 0.5% O

Hydrogen Sulfide:

± 5% of reading or ± 2 ppm H

S (whichever is greater)

Carbon Monoxide

± 5% of reading or ± 5 ppm CO (whichever is greater)

Operating Temperature 23°F to 104°F (-5°C to 40°C)

6 • 65-2485RK-02 Multi Point Detector

Description

This section describes the multi-point detector. It consists of the detectors, the terminal strips,

the conduit seal, and the junction boxes.

Detectors

This section describes the components of the various detectors that are used with the 65-

2485RK-02.

Oxygen Detector

The detector consists of the oxygen sensor, the detector housing body, detector housing cap,

and cap gasket.

Figure 1: Oxygen Detector Component Location

Detector Housing Body

The detector housing body protects the electronic components within the housing. Use the

mounting threads at the top of the housing to screw the oxygen detector into the 3/4 NPT hub

on the bottom of the junction box. Two wires extend from the top of the detector housing

body. Use these wires to connect the oxygen detector to the terminal block. One of the wires is

white and one of the wires is green.

The housing includes two sockets installed on a circuit board. These sockets accept the plug-

in sensor’s two pins to provide electrical connection for the sensor. The circuit board with the

sockets conditions the sensor’s signal before the signal reaches the controller.

Detector HousingBody

Detector Housing Cap

Flame Arrestor

Guard

Plug-in Oxygen Sensor

Cap Gasket

65-2485RK-02 Multi Point Detector • 7

Housing Cap & Cap Gasket

The housing cap screws onto the detector housing. It retains the plug-in sensor and protects it

from damage. A foam gasket is installed inside the housing cap that seals against the sensor

face. The housing cap also includes a flame arrestor which contains any sparks that may occur

within the detector and a flame arrestor guard which protects the flame arrestor from damage.

Unscrew the detector cap to access the plug-in sensor for maintenance or replacement. A cap

gasket seals the interface between the housing and cap.

Plug-in Oxygen Sensor

The plug-in sensor is secured in the detector assembly by the housing cap. It has two pins that

mate with the sockets in the detector housing body. Through a series of chemical and

electrical reactions, the sensor produces an electrical output that corresponds to the detection

range of the transmitter.

CO Detector

The detector consists of the CO sensor, charcoal filter with rubber boot, detector housing

body, detector housing cap, and cap gasket.

Figure 2: CO Detector Component Location

Detector Housing, Housing Cap, & Cap Gasket

The detector housing body protects the sensing components within the housing. Use the 3/4

NPT mounting threads at the top of the housing to screw the CO detector into the bottom

conduit hub of the junction box. Use the removable cap near the bottom of the housing to

access the sensor for maintenance or replacement. The cap protects the sensor from damage

and includes a flame arrestor which contains any sparks which may occur within the detector

housing. A cap gasket seals the interface between the housing and cap. A flame arrestor guard

is permanently bonded to the cap.

Two wires extend from the top of the detector housing body. Use these wires to connect the

Plug-In CO Sensor

Rubber Boot With

Charcoal Filter

Detector Housing Cap

Detector Housing Body

Cap Gasket

Flame Arrestor

Guard

8 • 65-2485RK-02 Multi Point Detector

CO detector to the multi-point detector. The housing includes a four-socket pattern. This

socket pattern accepts the sensor’s four pins to secure the sensor within the detector housing.

A pre-amplifier, located between the sockets and two interconnect wires, conditions the

sensor’s signal before the signal reaches the controller.

Plug-In Sensor

The sensor is secured within the sensor housing by the housing cap. It has four pins that mate

with the sockets in the detector housing body. Through a series of chemical and electrical

reactions, the sensor produces an electrical output that corresponds to the detection range of

the detector.

Charcoal Filter

The disc-shaped charcoal filter is secured to the face of the CO sensor with a rubber boot. The

charcoal filter prevents interference gases (hydrogen sulfide [H

S] and certain hydrocarbons)

from producing false CO readings.

S Detector

The detector consists of the detector housing body, detector housing cap, cap gasket, rubber

boot, spacer, and H

S sensor.

Figure 3: H

S Detector Component Location

Detector Housing, Housing Cap, & Cap Gasket

The detector housing protects the sensing components within the housing. Use the mounting

threads at the top of the housing to screw the H

S detector into a 3/4 NPT hub. Use the

removable cap near the bottom of the housing to access the sensor for maintenance or

replacement. The cap protects the sensor from damage and includes a flame arrestor which

Cap Gasket

Detector Housing Body

Detector

Housing Cap

Flame

Arrestor

Guard

H2S Plug-inSensor

Rubber Boot

Spacer

65-2485RK-02 Multi Point Detector • 9

contains any sparks which may occur within the detector housing. A cap gasket seals the

interface between the housing and cap. A flame arrestor guard is permanently bonded to the

cap.

Two wires extend from the top of the detector housing. Use these wires to connect the H

detector to the multi-point detector. The housing includes a four-socket pattern. This socket

pattern accepts the sensor’s four pins to secure the sensor within the detector housing. A pre-

amplifier, located between the sockets and two interconnect wires, conditions the sensor’s

signal before the signal reaches the controller.

Rubber Boot and Spacer

A rubber boot and spacer are installed between the detector housing cap and the sensor. They

help ensure that the detector remains plugged into the detector housing body.

Sensor

The sensor is secured within the sensor housing by the detector housing cap. It has four pins

that mate with the sockets in the detector housing body. Through a series of chemical and

electrical reactions, the sensor produces an electrical output that is proportional to the

detection range of the detector.

Junction Box

Use the junction box to install the multi-point detector at a mounting site that is remote from

the controller. The junction box protects the terminal strip and wiring connections made to the

terminal strip. Use the top 3/4 NPT conduit hub to connect wiring from the terminal strip to

the controller. Use the cover on the front of the junction box to access the interior of the

junction box. The detectors and terminal strip are factory installed in the junction box.

Installation

This section describes procedures to mount the multi-point detector in the monitoring

environment and wire the detector to a controller.

Mounting the Multi-Point Detector

1. Select a mounting site that is representative of the monitoring environment. Consider the

following when you select the mounting site.

• Select a site where the detector is not likely to be bumped or disturbed. Make sure

there is sufficient room to perform start-up, maintenance, and calibration procedures.

• Select a site where the target gases are likely to be found first.

10 • 65-2485RK-02 Multi Point Detector

Figure 4: Outline & Mounting Dimensions 65-2485RK-02

2. At the mounting site you select, use #10 screws to mount the detector to a vertical surface.

CAUTION: Mount the multi-point detector with the detectors facing down (see Figure 4).

NOTE: If your application does not require a specific mounting site, mount the detector at

approximately breathing level.

3/4 NPT Hubs (4X)

Oxygen

Detector

3.11

.25

.20 DIA X .45 Slot,(2X) ,mounting

1.10

Detector

2.40

H2S

Detector

3.00

3.15

3.00

1.25

7.75

8.44 max.

65-2485RK-02 Multi Point Detector • 11

Wiring the Multi-Point Detector to a Controller

WARNING: Always verify that the power source is OFF before you make wiring

connections.

1. Turn off the controller.

2. Turn off or unplug power to the controller.

3. Remove the junction box cover from the junction box.

WARNING: To maintain the explosion proof classification of the multi-point detector, a

conduit seal must be used within 2 inches of the junction box conduit hub used

for wiring to the controller.

4. Guide a six-conductor, shielded cable, or six wires in conduit through the top conduit hub

of the junction box. Use appropriate conduit fittings and construction technique for the

environmental rating and hazardous location classification of the junction box. The

junction box is rated NEMA 4X and classified explosion proof for Class I, Groups B, C,

and D.

5. Connect the wires to the multi-point detector using the terminal block in the junction box.

CAUTION: If using shielded cable, leave the drain wire insulated and disconnected at the

multi-point detector. You will connect the opposite end of the cable’s drain wire

at the controller.

6. Secure the junction box cover to the junction box.

7. Route the cable or wires leading from the multi-point detector through one of the conduit

hubs at the controller housing. Use appropriate conduit fittings and construction technique

for the environmental rating of the controller. RKI controllers are typically rated NEMA

4X.

CAUTION: Do not route power and multi-point detector wiring through the same conduit

hub. The power cable may disrupt the transmission of the detector signal to the

controller.

8. Connect the wires to the applicable controller terminal strips. See the controller operator’s

manual and the controller’s detector head specification sheet. Also see Figure 5 for a

wiring diagram.

12 • 65-2485RK-02 Multi Point Detector

Figure 5: Wiring the 65-2485RK-02 to a Controller

9. Connect the cable’s drain wire to an available chassis ground at the controller. RKI

controllers typically have a ground stud that can be used to ground the cable’s drain wire.

Green

White

Black

Red

Terminal Strip

ControllerH2S

Terminals

Black

Red

ControllerOxygen

Terminals

ControllerCO

Terminals

OxygenDetector

Wires

White

Green

OxygenDetector

CO Detector

Wires

Black

Red

Black

H2S Detector

Red

H2S Detector

Wires

CO Detector

65-2485RK-02 Multi Point Detector • 13

Start Up

This section describes procedures to start up the multi-point detector and place the detector

into normal operation.

Introducing Incoming Power

1. Complete the installation procedures described earlier in this manual.

2. Verify that the power wiring to the controller is correct and secure. Refer to the controller

operator’s manual.

3. Turn on power to the controller.

4. Turn on the controller.

5. Verify that the controller is on and operating properly. Refer to the controller operator’s

manual.

CAUTION: Allow the multi-point detector to warm up for 5 minutes before you continue

with the next section, “Setting the Zero (Fresh Air) Reading”.

Setting the Zero (Fresh Air) Reading

WARNING: If the detector installation is explosion proof, do not remove the detector

housing cap or junction box cover while the circuits are energized unless the

area is determined to be non-hazardous. Keep the detector housing cap and

junction box cover tightly closed during operation.

CAUTION: If you suspect the presence of a target gas in the monitoring environment, use

the calibration kit and a zero air calibration cylinder to introduce “fresh air” to

the desired detector and verify an accurate zero setting. See “Calibration, H

and CO Detectors” on page 21 or “Calibration, O

Detector” on page 23 for

instructions to introduce zero air to the desired detector.

1. Verify that the detector is in a fresh air environment (environment known to be free of

toxic gases, and of normal oxygen content, 20.9%).

2. At the controller, verify a reading of:

• 20.9% for oxygen

• 0 ppm for CO or H

If the display reading is the appropriate fresh air reading, start up is complete. The detector

is in normal operation. If the display reading is not the appropriate fresh air reading,

continue with step 3.

3. Perform a zeroing operation at the controller. See the controller operator’s manual for

directions.

14 • 65-2485RK-02 Multi Point Detector

Maintenance

This section describes maintenance procedures. It includes preventive maintenance,

troubleshooting, and component replacement procedures.

Preventive Maintenance

This section describes a preventive maintenance schedule to ensure the optimum performance

of the multi-point detector. It includes daily and quarterly procedures.

Daily

At the controller, verify a display reading of:

• 20.9% for oxygen

• 0 ppm for CO or H

Investigate significant changes in the display reading.

Quarterly

Calibrate the multi-point detector as described in the Calibration section of this manual.

Troubleshooting

The troubleshooting guide describes symptoms, probable causes, and recommended action for

problems you may encounter with the multi-point detector.

NOTE: This troubleshooting guide describes multi-point detector problems only. See the

controller operator’s manual for problems you may encounter with the controller.

Table 2: Troubleshooting the Multi-Point Detector

Condition Symptom(s) Probable Causes Recommended Action

Fail

Condition

Controller indicates a

fail condition.

• The detector wiring is

disconnected or

misconnected.

• The CO, O

, or H

plug-in sensor is not

properly plugged into

the sockets in the

detector housing body.

• The detector’s zero

reading is low enough

to cause a fail

condition.

• The detector is

malfunctioning.

1. Verify that the detector wiring is

correct and secure.

2. Confirm that the CO, O

, or H

plug-in sensor is installed properly.

3. Perform a zero adjustment. A full

calibration is recommended.

4. If the fail condition continues,

replace the CO, O

, or H

S plug-in

sensor as described later in this

section.

5. If the fail condition continues,

contact RKI for further instruction.

65-2485RK-02 Multi Point Detector • 15

Replacing Components of the Multi-Point Detector

This section includes maintenance procedures for the oxygen detector, the CO detector, and

the H

S detector.

Oxygen Detector

This section contains instructions to replace the plug-in oxygen sensor and to replace the

entire detector assembly. In most cases it in not necessary to replace the entire detector

assembly.

Replacing the Plug-In Oxygen Sensor

CAUTION: The plug-in sensor contains electrolyte that is an irritant. Do not disassemble

the sensor when replacing it with a new one. If electrolyte comes in contact with

your skin, wash affected area thoroughly with soap and water.

1. Turn off the controller.

2. Turn off or unplug power to the controller.

3. Unscrew the detector housing cap from the detector housing body. Make sure not to lose

the cap gasket.

4. Unplug and remove the oxygen sensor.

5. Carefully plug the replacement sensor into the socket pattern that is located in the detector

housing.

Slow or No

Response/

Difficult or

Unable to

Calibrate

• Unable to accurately

set the zero or

response reading

during calibration.

• Detector requires

frequent calibration.

Note: Under

“normal”

circumstances, the

transmitter requires

calibration once every

3 months.

Some applications

may require a more

frequent calibration

schedule.

• The calibration

cylinder is low, out-

dated, or defective.

• The flame arrestor in

the CO, O

, or H

detector housing cap is

wet or clogged with

dirt or other

particulates.

• The calibration gas is

not an appropriate

concentration.

• The detector is

malfunctioning.

1. Verify that the calibration cylinder

contains an adequate supply of a

fresh test sample.

2. Check the detector housing cap to

determine if the flame arrestor is wet

or dirty. Clean if necessary.

3. Verify that the calibration gas

concentration is appropriate for each

detector.

4. If the calibration/response difficulties

continue, replace the CO, O

, or H

plug-in sensor as described later in

this section.

5. If the calibration/response difficulties

continue, contact RKI for further

instruction.

Unexplained

Upscale

Readings or

Alarms

• Controller indicates

a reading that cannot

be verified.

• Alarms occur at the

controller that cannot

be explained.

• Charcoal filter in CO

detector is saturated

and no longer

scrubbing out

interfering gases.

1. Replace charcoal filter in the CO

detector.

2. If difficulties continue, contact RKI

for further instructions.

Condition Symptom(s) Probable Causes Recommended Action

16 • 65-2485RK-02 Multi Point Detector

6. Make sure the cap gasket is in place and screw the detector housing cap back onto the

detector housing body.

7. Turn on or plug in power to the controller.

8. Turn on the controller and place into normal operation.

CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with

the next step.

9. Calibrate the detector as described in “Calibration, O

Detector” on page 23.

Replacing the Oxygen Detector

NOTE: In most cases, it is only necessary to replace the oxygen sensor.

1. Turn off the controller.

2. Turn off or unplug incoming power to the controller.

3. Remove the junction box cover from the junction box.

4. Disconnect the detector leads from the terminal block in the junction box. Note the

position of the color-coded leads as you remove them.

5. Unscrew the detector from the junction box hub.

6. Guide the detector leads of the replacement detector through the junction box hub then

screw the mounting threads of the detector into the hub. If necessary for environmental

conditions, apply thread sealant or Teflon tape to the hub and/or detector threads to seal

them.

7. Connect the detector leads to the terminal block the same way the old detector was wired.

See the controller operator’s manual and the controller’s detector head specification sheet

for the oxygen detector to verify the connections are correct. Also see Figure 5 for a

wiring diagram.

8. Reinstall the junction box cover.

9. Turn on or plug in power to the controller.

10. Turn on the controller.

CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue

with the next step.

11. Calibrate the replacement detector as described in “Calibration, O

Detector” on page 23.

65-2485RK-02 Multi Point Detector • 17

CO Detector

This section includes a procedure to replace the plug-in sensor, one to replace the charcoal

filter, and one to replace the entire detector assembly. In most cases it is not necessary to

replace the entire detector assembly.

Replacing the Plug-In CO Sensor

CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the

sensor when replacing it with a new one. If sensor electrolyte comes in contact

with your skin, wash affected area thoroughly with soap and water.

1. Turn off the controller.

2. Turn off or unplug power to the controller.

3. Unscrew the detector housing cap from the detector housing body. Make sure not to lose

the cap gasket.

4. Unplug and remove the CO sensor with the boot and charcoal filter attached.

5. Remove the rubber boot and charcoal filter from the old sensor.

6. Remove the replacement sensor from its packaging and remove the wire jumper. This wire

jumper is installed on the sensor pins for shipment or storage but must be removed for the

sensor to operate properly when installed in a detector.

WARNING: The CO sensor will not operate properly if the wire jumper is not removed.

7. Install the rubber boot with charcoal filter onto the replacement sensor’s face.

8. Carefully plug the replacement sensor into the four-socket pattern that is located in the

detector housing.

9. Make sure the cap gasket is in place and screw the detector housing cap back onto the

detector housing body.

10. Turn on or plug in power to the controller.

11. Turn on the controller and place into normal operation.

CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with

the next step.

Figure 6: Plug-In Sensor Jumper Removal

Remove jumper

18 • 65-2485RK-02 Multi Point Detector

12. Calibrate the replacement sensor as described in “Calibration, H

S and CO Detectors” on

page 21.

Replacing the Charcoal Filter

1. Turn off the controller.

2. Turn off or unplug power to the controller.

3. Unscrew the detector housing cap from the detector housing body.

4. Unplug and remove the CO sensor with the boot and charcoal filter attached.

5. Remove the rubber boot that secures the charcoal filter to the CO sensor.

6. Remove the charcoal filter from the rubber boot.

7. Place the replacement filter in the rubber boot in the same position as the filter you

removed in the previous step.

8. Reinstall the rubber boot with charcoal filter to the CO sensor.

9. Carefully plug the replacement sensor into the four-socket pattern that is located in the

detector housing.

10. Make sure the cap gasket is in place and screw the detector housing cap back onto the

detector housing body.

11. Turn on or plug in power to the controller.

12. Turn on the controller and place into normal operation.

Replacing the CO Detector

NOTE: In most cases, it is only necessary to replace the CO sensor.

1. Turn off the controller.

2. Turn off or unplug power to the controller.

3. Remove the junction box cover from the junction box.

4. Disconnect the detector leads from the terminal block in the junction box. Note the

position of the color-coded leads as you remove them.

5. Unscrew the detector from the junction box hub.

6. Guide the detector leads of the replacement detector through the junction box hub then

screw the mounting threads of the detector into the hub. If necessary for environmental

conditions, apply thread sealant or Teflon tape to the hub and/or detector threads to seal

them.

7. Connect the detector leads to the terminal block the same way the old detector was wired.

See the controller operator’s manual and the controller’s detector head specification sheet

to verify the connections are correct. Also see Figure 5 for a wiring diagram.

8. Reinstall the junction box cover.

9. Turn on or plug in power to the controller.

65-2485RK-02 Multi Point Detector • 19

10. Turn on the controller and place into normal operation.

CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue

with the next step.

11. Calibrate the replacement detector as described in the “Calibration, H

S and CO

Detectors” on page 21.

S Detector

This section includes a procedure to replace the H

S sensor and one to replace the entire

detector assembly. In most cases it is not necessary to replace the entire detector assembly.

Replacing the Plug-In H

S Sensor

CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the

sensor when replacing it with a new one. If sensor electrolyte comes in contact

with your skin, wash affected area thoroughly with soap and water.

1. Turn off the controller.

2. Turn off or unplug power to the controller.

3. Unscrew the detector housing cap from the detector housing body. Make sure not to lose

the cap gasket.

4. Unplug and remove the H

S sensor with the rubber boot and spacer attached.

5. Remove the rubber boot and spacer from the old sensor.

6. Remove the replacement sensor from its packaging and remove the wire jumper. This wire

jumper is installed on the sensor pins for shipment or storage but must be removed for the

sensor to operate properly when installed in a detector.

WARNING: The H

S sensor will not operate properly if the wire jumper is not removed.

7. Install the spacer and rubber boot onto the replacement sensor’s face.

8. Carefully plug the replacement sensor into the socket pattern that is located in the detector

housing.

Figure 7: Plug-In Sensor Jumper Removal

Remove jumper

20 • 65-2485RK-02 Multi Point Detector

9. Make sure the cap gasket is in place and screw the detector housing cap onto the detector

housing body.

10. Turn on or plug in power to the controller.

11. Turn on the controller.

CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with

the next step.

12. Calibrate the detector as described in “Calibration, H

S and CO Detectors” on page 21.

Replacing the H

S Detector

NOTE: In most cases, it is only necessary to replace the H

S sensor.

1. Turn off the controller.

2. Turn off or unplug power to the controller.

3. Remove the junction box cover from the junction box.

4. Disconnect the detector leads from the terminal block in the junction box. Note the

position of the color-coded leads as you remove them.

5. Unscrew the detector from the junction box hub.

6. Guide the detector leads of the replacement detector through the junction box hub then

screw the mounting threads of the detector into the hub. If necessary for environmental

conditions, apply thread sealant or Teflon tape to the hub and/or detector threads to seal

them.

7. Connect the detector leads to the terminal block the same way the old detector was wired.

See the controller operator’s manual and the controller’s detector head specification sheet

for the H

S detector to verify the connections are correct. Also see Figure 5 for a wiring

diagram.

8. Reinstall the junction box cover.

9. Turn on or plug in power to the controller.

10. Turn on the controller.

CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue

with the next step.

11. Calibrate the replacement detector as described in “Calibration, H

S and CO Detectors”

on page 21.

Page is loading ...

RKI Instruments 65-2485RK-02 Owner's manual

RKI Instruments 65-2485RK-02 Owner's manual

RKI Instruments 65-2485RK-02 Owner's manual

Related papers

Other documents